On 26/08/2016 11:46, Davey wrote:

Be wary that some companies might not have 'visible' CLI numbers. Our
local health centre comes up as private, and I read that some Councils
also do that.


If a human is making the call they can still get through to you, or your
answering machine, even if they do withhold a number and withheld
numbers are filtered out. With these systems any blocked number can be
automatically answered by the phone and the caller informed of an
alternative way of getting through which requires a simple human
response - something the autodialler with pre-recorded messages don't
yet manage and cold callers don't seem to bother with.

Even if a cold caller bothers with the alternative means a second level
of checking allows the call to be rejected without being answered and/or
a presented number being added to a black list.

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